I'm building a step sequencer and want to share with those who are interested.
With the help of schematics found on the internet, I breadboarded a nice
working sequencer.
With a 555 clock generator, the cgs24 gate to trigger converter and the 4017 baby10 based sequencer.
I build a 3x8 step gate/trigger sequencer with electronic switch.
The pcb foil I made with the help of Sprint-Layout.
Didn't do the schematics, but I can show the pcb and front design.
Also I finished the aluminium front and working on the pcb.

Next update I hope it's finished !!

Chris.

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Last edited by KRS1972 on Mon Oct 01, 2012 11:30 am; edited 1 time in total

this is just a great gift to the community!! and it also already includes reset and manual step!!!! i believe shouldnt be so difficult to add, eventually an optional(?) cv controll and voila! waiting for updates and really curious to etch a couple of these babies

Looks to me like you could use the individual pulse outputs to drive a bank of CV pots, similar to Baby 10. It's not clear to me whether those are selectable for a specific bank (A/B/C) or would be the gate of an OR of the three banks, but either way that seems like it could be used that way.

Is there some way that the pulse from the sequencer is only triggering after an entire bank is complete? i.e. we step through the 8 steps of Bank A and then pulse, 8 steps of Bank B and then Pulse, and then (if not reset thanks to the spdt switch) 8 steps of Bank C and then Pulse?

Is there some way that the pulse from the sequencer is only triggering after an entire bank is complete? i.e. we step through the 8 steps of Bank A and then pulse, 8 steps of Bank B and then Pulse, and then (if not reset thanks to the spdt switch) 8 steps of Bank C and then Pulse?

And if you stack all the pulse outputs of the sequencer into the trigger in from the electronic switch, it switches 8 times in a bank.

Nice work, KRS - looks good.
I'm building a similar project now - 3x8, chainable, clock dividers, etc. My chaining switch is based on the exact circuit you posted.

That book is called Sound Synthesis, from 1990.
It is the source of the original "Baby 10" sequencer schematic, as well. Great book, full of useful ideas, schematics, and layouts... also chock full of so many horrible, horrible schematic mistakes, you'll be punching yourself in the face a lot if you build from it. Still - quite useful. I got it for $2 on the internet.

P.S. Elmegil --
In answer to your question, the 'pulse' coming into the switch 4017 is just the 'end out' of the sequencer... which can be tapped from pin 15 (reset) of the sequencer 4017. The 4017 in the switch circuit is a different IC than the 4017 driving the 8 sequencer steps.

So - every time the sequencer resets back to the first step, it pulses the switch to the next channel.

Nice work, KRS - looks good.
I'm building a similar project now - 3x8, chainable, clock dividers, etc. My chaining switch is based on the exact circuit you posted.

That book is called Sound Synthesis, from 1990.
It is the source of the original "Baby 10" sequencer schematic, as well. Great book, full of useful ideas, schematics, and layouts... also chock full of so many horrible, horrible schematic mistakes, you'll be punching yourself in the face a lot if you build from it. Still - quite useful. I got it for $2 on the internet.

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